Stator of an electric machine

ABSTRACT

The present invention relates to electric machines and in particular, to gas filled stators of electric machines. The concept of the invention consists in that the stator of the electric machine comprising end pieces and a middle section with a core compressed with bracing ribs and pressure flanges is designed so that the end pieces of the stator are joined to the middle section with the use of the pressure flanges of the stator core.

United States Patent Konovalov et a1.

[54] STATOR OF AN ELECTRIC MACHINE [72] Inventors: Boris LeonidovichKonovalov, 603

'mikroraion, l, kv. 346; Boris Volkovich Spivak, ulitsa Kosiora, 56, kv.55; Evgeny Khaimovich Glider, prospekt Ordzhonikidze, 18, kv. 55; OlegBorisovich Gradov, ulitsa Kosiora, 6, kv. 1; David BentsionovichKarpman, ulitsa Frantisheka Krala, 49, kv. 54; Vasily SemenovichKildishev, ulitsa Plekhanovskaya, 41/43, kv. 55; Lazar YankelevichStanislavsky, ulitsa Mayakovskogo, 11, kv. 24, all of Kharkov, U.S.S.R.

[22] Filed: Jan. 7, 1971 [21] Appl. No.: 104,719

[52] U.S. Cl. ..310/258 [51] Int. Cl. ..H02k 1/18 [58] Field of Search..310/55, 57, 258, 259, 216,

[ Aug. 8,1972

[56] References Cited UNITED STATES PATENTS 1,685,742 9/1928 George..310/217 X 2,489,109 11/1949 Shildnedt ct a1 ..310/57 3,571,635 3/1971Turner ..310/258 X Primary Examiner-D. F. Duggan Attorney-Waters,Roditi, Schwartz & Nissen [57] r ABSTRACT The present invention relatesto electric machines and in particular, to gas filled stators ofelectric machines.

The concept of the invention consists in that the stator of the electricmachine comprising end pieces and a middle section with a corecompressed with bracing ribs and pressure flanges is designed so thatthe end pieces of the stator are joined to the middle section with theuse of the pressure flanges of the stator core.

5 Claims, 2 Drawing Figures 1 STATOR OF AN ELECTRIC MACHINE The presentinvention relates to electric machines and, in particular, to gas filledstators of electric machines.

Known in the art are stators comprising a middle section and two endpieces that are connected to the middle section either rigidly or byelastic members.

Stators of such electric machines are fixed along their total lengthsand filled with a cooling or an inert gas.

The general disadvantage of this manner of joining end pieces with themiddle section of the body of an electric machine stator is that itrequires the middle section of the body to be provided with a gastightshell. The use of this shell increases considerably the weight of themiddle section of the stator and makes its structure quite complex.

An object of the present invention is to obviate this disadvantage.

A more specific object of the invention is to provide a means which,while preserving the airtightness of the joint between the middlesection of the stator body and its end pieces, will make it possible toprovide stators with less complex and less heavy structures.

These objects are attained in the stator of an electric machinecomprising end pieces and the middle section with a core compressed withbracing ribs and pressure flanges, in which, according to the invention,the end pieces are joined to the middle section by means of pressureflanges of the core of the stators.

This arrangement makes it possible to use the body of the stator core asa gastight shell and, therefore, to simplify the structure of the statorand reduce its weight.

To make the inner cavity of the stator body airtight it is preferablethat sealing spacers be fixed in the areas where the bracing ribs passthrough the flanges and at the points where pressure flanges are joinedto the stator core.

Given below is a detailed description of a preferred embodiment of anelectric machine stator according to the invention with reference to theaccompanying 2 drawings, in which:

FIG. 1 is a side view of an electric machine having a stator whose bodyconsists of a middle section and two end pieces; and

FIG. 2 is an enlarged sectional view of detail A of FIG. 1 showing thejoint between an end piece of the stator body and the middle sectionaccording to the invention.

An end piece (FIG. 1) of stator body 2 is joined to a pressing flange 3(FIG. 2) of stator core 4 by means of a sealing spacer 5. This spacer ispressed against the pressure flange 3 and the end piece 1circumferentially by straps 6 to ensure an airtight joint. The jointbetween the pressure flange 3 and the stator core 4 which is glued alongits total length is made airtight with the use of a sealing spacer 7pressed circumferentially against the pressure flange 3 and the statorcore 4 with straps 8.

The areas'where bracing ribs 9 pass through the pressure flange 3 aremade airtight bythe use of sealing spacers 10 which are pressed againstthe bracing ribs 9 and the pressure flange 3 by 11.

stator 0 an electric machine comprising a middle section; end pieces;and means joining the end pieces to the middle section; said middlesection including a core, and bracing means and pressure flangescompressing said core, said means joining the end pieces to the middlesection via said pressure flanges.

2. A stator as claimed in claim 1 in which said means includes sealingspacers between said end pieces and the pressure flanges and between thepressure flanges and the 'core.

3. A stator as claimed in claim 2 comprising additional sealing spacersbetween said bracing means and said pressure flanges.

4. A stator as claimed in claim 3 wherein said bracing means comprisesthreaded bracing ribs passing through said pressure flanges, and nutsthreaded on said ribs to press the flanges against said core.

5. A stator as claimed in claim 1 wherein said stator core is heldtogether by glue applied along its entire length, said bracing meanscomprising bracing ribs passing through said pressure flanges.

1. A stator of an electric machine comprising a middle section; endpieces; and means joining the end pieces to the middle section; saidmiddle section including a core, and bracing means and pressure flangescompressing said core, said means joining the end pieces to the middlesection via said pressure flanges.
 2. A stator as claimed in claim 1 inwhich said means includes sealing spacers between said end pieces andthe pressure flanges and between the pressure flanges and the core.
 3. Astator as claimed in claim 2 comprising additional sealing spacersbetween said bracing means and said pressure flanges.
 4. A stator asclaimed in claim 3 wherein said bracing means comprises threaded bracingribs passing through said pressure flanges, and nuts threaded on saidribs to press the flanges against said core.
 5. A stator as claimed inclaim 1 wherein said stator core is held together by glue applied alongits entire length, said bracing means comprising bracing ribs passingthrough said pressure flanges.